...and then all three realized
that they had forgotten to bring their wallet and the bar only accepts cash.

Panic, and with a reputation to
protect (because they were award-winning celebrities, highly respected, and
renowned leaders in their respective fields), they pleaded for the bartender's
understanding and trust. They asked for a phone call and gave references to
back up their credentials. But no one picked up their calls and the references
were alien names to the bartender. In desperation, they even went around asking
the other half-drunk patrons whether they have read about their great exploits
and inventions or seen them on tv. But none of them knew. Not even a soul in
the bar.

So, the pissed-off bartender
dialed for the police and all three prominent figures - half drunk themselves -
were arrested and spent a night in a dinghy cell held in remand pending bail.
In the cell, they continued where they had left off in the bar...they argued
about everything and anything under the sun.

If you are looking for the punch-line,
it is somewhere between knowing everything and not having anything (to pay for
the drinks).

...sometimes in life, people
don't care how much you know until they know how much you care; and in this
case, to settle the bill. Cheerz.